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The researcher makes observations based on his knowledge and from previous experiments. He then proposes a hypothesis and designs the experiment. He collects data from various sources then analyzes the data. At this point, a determination of bias in the data should be made. If the data is thought to be biased the experiment must be redesigned, if not you can refine the hypothesis and proceed. Next, perform the experiment and repeat it. If the results are not repeatable you must propose an alternative hypothesis. If the results are repeatable they are accepted as a theory. When other researchers perform the exact experiment and get the same results, it is accepted as a law. However, if other researchers can't achieve the same results, it is rejected by the scientific community in that particular discipline.
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